Bare Copper Conductor

Bare copper, solid or stranded. Available in tempers hard and annealed. The conductors are concentrically stranded. Stranded Class 2 bare copper conductor to BS EN 60228 / IEC 60228 cables are non insulated and non sheathed soft drawn copper to BS 6360/81.

Applications

Stranded bare soft or annealed copper conductors are recommended for use as neutrals, Solid and stranded bare copper conductors are suitable for overhead transmission and distribution applications. Stranded conductors of greater flexibility are suitable for uninsulated connection, jumpers and grounds in electrical construction.

Construction

Bare copper conductors are compressed concentric-lay-stranded consisting of one or more layers of wire wrapped helically around a straight round central wire. Each successive layer has six wires more than the layer immediately beneath. Greater flexibility is afforded by using Class 2 stranding. The direction of lay for the outer layer is left hand lay. In 7,19 and 37 wire constructions, the direction of lay of each successive layer is reversed.

Feature

Stranded bare soft or annealed copper conductors are suitable for direct burial and do not suffer from the inherent corrosion problems that an aluminum conductor would. Copper is almost twice as conductive as aluminum. Copper is easier than aluminum to terminate and join at splices and joints.

Specification

Construction characteristics
Conductor material	Electrolytic, stranded and bare copper
Conductor class	Class 2 according to BS EN60228
Usage characteristics
Minimum Installation Temperature	0°C
Maximum Installation Temperature	60°C
Minimum Operating Temperature	-15°C
Maximum Operating Temperature	70°C
Maximum conductor temperature	90°C
Linear resistance at 20°C	According to BS EN60228 / IEC 60228
Short-circuit max. conductor temperature	370°C
Mechanical characteristics
Min. Bending Radius	35mm2 up to 400mm2 = 6 x OD

Standard

BS 6360, BS EN 60228 / IEC 60228

Specifications

Bare Copper Conductor Parameters

Nominal Sectional Area	Number & Diameter of Wire	Overall Diameter	Maximum Conductor Resistance at 20° C	Allowable Ampacities in Free Air	Cable Weight (approx)	Standard Packing
mm²	No. / mm	mm	Ω/km	A	kg / km	m
10	7/1.35	4.05	1.83	90	90	1,000/R
16	7/1.70	5.1	1.15	125	143	1,000/R
25	7/2.14	6.42	0.727	160	227	1,000/R
35	19/1.53	7.65	0.524	200	314	1,000/R
50	19/1.78	8.9	0.387	250	428	1,000/R
70	19/2.14	10.7	0.268	310	618	1,000/R
95	19/2.52	12.6	0.193	380	858	1,000/R
120	37/2.03	14.21	0.153	440	1097	1,000/R
150	37/2.25	15.75	0.124	510	1334	1,000/R
185	37/2.52	17.64	0.0991	585	1673	1,000/R
240	61/2.25	20.25	0.0754	700	2200	1,000/R
300	61/2.52	22.68	0.0601	800	2760	1,000/R
400	61/2.85	25.65	0.047	900	3350	1,000/R
500	61/3.20	28.8	0.0366	1110	4451	500/R